KR20070089815A - Liquid cartridge containing recording liquid, liquid delivery apparatus and delivery method - Google Patents

Abstract

This invention provides a recording liquid for printing and recording information in printing objects such as recording paper. This recording liquid comprises coloring matter, a solvent for dissolving or dispersing the coloring matter, and a water soluble organic solvent of which the peak appearance time in a penetration characteristic curve for plain paper having a Cobb30 value, specified in JIS P 8140:1998 and measured with an ultrasonic transmission dynamic liquid penetration measuring device, of 22 ± 2 g/m^2 is not less than 0.1 sec and not more than 0.5 sec. The water soluble organic solvent is any of 2-ethyl-2-propyl-1,3-propanediol, 2-methyl-2-butyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, and 2 propyl-1,4-butanediol.

Description

Liquid Cartridge Containing Recording Liquid, Liquid Delivery Apparatus and Delivery Method}

The present invention provides a recording liquid for printing and recording information on a printing object such as a recording paper, a liquid cartridge containing the recording liquid, a liquid ejecting device for ejecting the recording liquid contained in the liquid cartridge into the object in the form of droplets from the discharge port; It relates to a liquid discharge method.

This application claims priority based on Japanese Patent Application No. 2004-374465 for which it applied on December 24, 2004 in Japan, and uses this application for reference.

As a conventional liquid ejecting apparatus, there is an ink jet printer apparatus which ejects ink, which is a recording liquid, onto a recording sheet to be a recording object, and records information such as an image or a character. This ink jet printer apparatus has advantages of low running cost, miniaturization of the apparatus, and coloration of a printed image.

Examples of the ink jet method for ejecting liquid ink include a deflection method, a cavity method, a thermojet method, a bubble jet (registered trademark) method, a thermal ink jet method, a slit jet method, a spark jet method, and the like. have. In these ink jet systems, the ink is ejected from the ejection port of the ink ejection head for discharging the ink in the droplet state, so-called nozzles, and the images are recorded on the recording paper to record images and characters.

In an ink jet recording type printer apparatus, not only the ink jet recording paper but also plain paper such as copy paper and report paper may be printed. Therefore, the ink used in the ink jet recording method has a high image density, especially when printing on not only an ink jet recording paper but also plain paper, and has a high image density, bleeding of images and characters, specifically, smearing of boundaries between different colors, solid color stains, and the like. It is demanded to enable high quality image printing with little ink shining. In order to meet these demands, the following are proposed as inks used in the ink jet recording method.

As one of them, there is a thing described in Japanese Patent Publication (S) 60-23793 (Document 1). The ink of this document 1 improves drying property by using dialkyl sulfosuccinic acid as surfactant. The ink described in this document 1 has a narrow pH range that can be expected to improve the drying property, and has a low drop in the improvement effect and a ignition concentration over time.

In addition, Japanese Unexamined Patent Application Publication No. 56-57862 (Patent 2) proposes an ink in which image blur is suppressed by adding a strong base substance. The ink described in this document 2 is effective only when used for an acidic paper, and it is hard to exert an effect on the plain paper of neutral paper form.

Furthermore, in JP-A-6-157959 (Document 3) and JP-A-2003-3100 (Document 4), a wetting agent, a surfactant, and 2-ethyl-1,3-hexanediol are used. The ink which improved the image bleeding, especially the image bleeding of a neutral part, by containing each specific amount is proposed. Although the inks described in Documents 3 and 4 are capable of improving image blurring, the image shining is large, the image density is low, and it is difficult to obtain a sufficiently satisfactory high quality image.

Moreover, in Unexamined-Japanese-Patent No. 2003-253167 (document 5), the ink which suppressed the immersion of ink by containing 2, 4- diethyl- 1, 5- pentanediol is described. Although the ink described in Document 5 is capable of improving image blur, similarly to the ink described in Documents 3 and 4, the light of the image is large, the image density is low, and it is difficult to obtain a sufficiently satisfactory high quality image.

Japanese Unexamined Patent Application Publication No. Hei 8-170041 (Document 6) discloses an ink in which drying property and image bleeding are improved by containing propylene glycol monopropyl ether. The ink described in this document 6 had low effect of drying property and image blurring, and it was difficult to obtain a sufficiently high quality image.

Further, in the ink jet recording type printer apparatus, for example, in a printer apparatus capable of printing at a high speed on a recording sheet, that is, a line type printer apparatus having a range substantially equal to the width of the recording sheet as an ink ejection range, an image , Smearing of letters, shining of ink, etc. occur remarkably.

Specifically, in the line type printer apparatus, since the ejection period of the ink for each nozzle line in which the nozzles for ejecting ink are arranged in a range substantially the same as the width of the recording paper is very short, it is necessary to use ink having excellent penetration into the recording paper. However, when ink having excellent permeability is printed on plain paper or the like, the printing density decreases because the ink is soaked in the depth direction of the plain paper, that is, the thickness direction. In addition, in the line type printer apparatus, ink discharged on recording paper is very short even when ink having excellent permeability is used in the case of so-called color printing, which prints on recording paper by discharging ink of different colors. Since the ink of the next color is impacted in turn in a state where the ink does not sufficiently penetrate into the paper, boundary smears or mixed solid stains between the respective colors occur.

The present invention has been proposed in view of the above-mentioned problems, and has a high print density, is capable of preventing boundary smearing, mixed color solid stains, and incidence of ink, and enables recording of high quality images. It is an object of the present invention to provide a liquid ejecting device and a liquid ejecting method for performing high quality printing by using a liquid cartridge accommodated, a recording liquid contained in the liquid cartridge.

The recording liquid of the present invention is attached to an object in the form of droplets for recording on an object to be printed such as a recording paper, and the like, a dye, a solvent for dissolving or dispersing the dye, and an ultrasonic permeable dynamic liquid permeability measuring device. It contains a water-soluble organic solvent having a peak appearance time of a penetration characteristic curve for a plain paper having a Cobb ₃₀ value defined in JIS P8140: 1998 of 22 ± 2 g / m ² measured in the above.

Further, the liquid cartridge of the present invention is attached to a liquid ejecting head provided in a liquid ejecting apparatus for recording by ejecting a recording liquid in a droplet state and adhering to an object to be printed such as recording paper, and recording the liquid ejecting head. It is a source of liquid, and the recording liquid has a pigment, a solvent for dissolving or dispersing the pigment, and a Cobb ₃₀ value defined in JIS P8140: 1998 measured by an ultrasonic permeable dynamic liquid permeability measuring device having 22 ± 2 g / m ² . The water-soluble organic solvent whose peak appearance time of the penetration characteristic curve with respect to a plain paper is 0.1 second or more and 0.5 second or less is contained.

Further, the liquid ejecting apparatus of the present invention pressurizes the apparatus main body, a liquid chamber installed in the apparatus main body and storing the recording liquid, a supply unit for supplying the recording liquid to the liquid chamber, and one or more recording liquids installed in the liquid chamber and stored in the liquid chamber. A liquid discharge head having a pressure generating element to be discharged from each of the liquid chambers to the main surface of the object in a droplet state from the liquid chamber, and a liquid discharge head connected to the liquid discharge head to A liquid cartridge serving as a source, the recording liquid contains a pigment, a solvent for dissolving or dispersing the pigment, and a Cobb ₃₀ value defined in JIS P8140: 1998 measured by an ultrasonic permeable dynamic liquid permeability measuring device, 22 ± 2 g / the peak occurrence time of penetration curve characteristic as to whether m ² is usually a water-soluble organic solvent is contained in 0.5 seconds or less than 0.1 second.

Further, the liquid discharge method of the present invention pressurizes the apparatus main body, a liquid chamber installed in the apparatus main body and storing the recording liquid, a supply unit for supplying the recording liquid to the liquid chamber, and one or more recording liquids installed in the liquid chamber and stored in the liquid chamber. A liquid discharge head having a pressure generating element to be discharged from each of the liquid chambers to the main surface of the object in a droplet state from the liquid chamber, and a liquid discharge head connected to the liquid discharge head to A liquid discharge device having a liquid cartridge serving as a source, wherein the cobb ₃₀ value specified in JIS P8140: 1998 measured by a dye, a solvent for dissolving or dispersing the dye, and an ultrasonic permeable dynamic liquid permeability measuring device is 22 ±. A water-soluble organic solvent is contained in which the peak appearance time of the permeation characteristic curve for plain paper of 2 g / m ² is 0.1 to 0.5 seconds.

According to the present invention, the peak appearance time of the penetration characteristic curve for plain paper having a Cobb ₃₀ value of 22 ± 2 g / m ² as defined in JIS P8140: 1998 measured by the ultrasonic permeable dynamic liquid permeability measuring device in the recording liquid is 0.1 second. By containing the water-soluble organic solvent in 0.5 seconds or less, the recording liquid penetrates uniformly to the object, the ignition concentration is high, and problems such as boundary smearing, mixed color solid staining and shining can be prevented.

Another object of the present invention, the specific advantages obtained by the present invention will become more apparent from the embodiments described below with reference to the drawings.

1 is a perspective view showing a printer device to which the present invention is applied.

2 is a perspective view showing a head cartridge installed in a printer device.

3 is a cross-sectional view showing the head cartridge.

4 is a side view showing the ultrasonic permeable dynamic liquid permeability measuring device.

5 is a characteristic diagram showing the relationship between the immersion time and the received signal strength when the penetration of the test liquid into the test paper is measured using a printer device.

6 is a cross-sectional view showing the relationship between the ink tank and the ink ejecting head in the head cartridge.

7 is a cross-sectional view showing the structure of the ink discharge head.

FIG. 8A is a cross-sectional view of the ink discharge head showing a state where bubbles are generated in the heat generating resistor, and FIG. 8B is a cross-sectional view of the ink discharge head showing a state where ink droplets are ejected from the nozzle.

Fig. 9 is a side view showing part of the printer apparatus through a perspective view.

Fig. 10 is a side view of the printer device, partially showing a state where the head cap is open.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the recording liquid, the liquid cartridge, the liquid discharge apparatus, and the liquid discharge method to which this invention was applied is demonstrated with reference to drawings.

Fig. 1 shows an example in which the present invention is applied to an ink jet printer apparatus (hereinafter simply referred to as a printer apparatus). The printer apparatus 1 applies a recording liquid such as ink to a recording paper P traveling in a predetermined direction. It discharges and records and prints an image or a character. This printer device 1 is a line type printer device in which ink discharge ports (nozzles) are formed in a line in the width direction of the recording paper P, that is, the arrow W in FIG. 1, in accordance with the printing width of the recording paper P. FIG. Here, as the recording paper P, plain paper such as ink jet recording paper dedicated for ink jet printer apparatus, copy paper, report paper or the like is used.

As shown in Figs. 2 and 3, this printer apparatus 1 is an ink jet printer head cartridge for discharging ink 2, which is a recording liquid for recording images, characters, and the like, on the recording paper P (hereinafter, simply referred to as a head). And a device main body 4 to which the head cartridge 3 is mounted. The printer device 1 is an ink which is a liquid cartridge in which the head cartridge 3 is detachable with respect to the apparatus main body 4, becomes an ink supply source with respect to the head cartridge 3, and accommodates ink 2 of each color, respectively. The tanks 5y, 5m, 5c, 5k are mounted to be detachable. In this printer apparatus 1, the head cartridge 3 which can be attached and detached with respect to the apparatus main body 4, and the ink tank 5y, 5m, 5c which accommodated the ink of each color which can be attached or detached with respect to the head cartridge 3 are contained. , 5k) can be replaced as a consumable.

In such a printer apparatus 1, the tray 55a for stacking and storing the recording paper P is attached to the tray mounting portion 6 provided in the bottom surface portion of the front side of the apparatus main body 4, thereby to the tray 55a. The stored recording paper P is transferred from the paper feed port 55 of the tray mounting portion 6 into the apparatus main body 4 and travels inside the apparatus main body 4. In the printer apparatus 1, the recording paper P traveling inside the apparatus main body 4 is printed as a character or an image according to character data or image data input from an information processing apparatus such as a personal computer, and the apparatus main body 4 ) Is discharged to the discharge port 56 on the front side.

The ink 2, which is a recording liquid used for recording information such as letters and images, contains a dye, a solvent for dissolving or dispersing the dye, and a water-soluble organic solvent for improving the penetration into the recording paper P. have.

As a dye, although dye, pigment, colored polymer microparticles | fine-particles, etc. which are conventionally used can be used individually or in mixture, it is preferable to use water-soluble dye especially. As the water-soluble dye, any one of an acid dye, a direct dye, a basic dye, a reactive dye, and an food dye can be used. However, it is preferable to select appropriately from the viewpoints of solubility in water, color development, and fastness.

Specifically, as a yellow type water-soluble dye, it is C.I. Acid yellow 17, C.I. Acid yellow 23, C.I. Acid yellow 42, C.I. Acid yellow 44, C.I. Acid Yellow 79, C.I. Acid yellow 142, C.I. Food Yellow 3, C.I. Food Yellow 4, C.I. Direct Yellow 1, C.I. Direct Yellow 12, C.I. Direct Yellow 24, C.I. Direct Yellow 26, C.I. Direct Yellow 33, C.I. Direct Yellow 44, C.I. Direct Yellow 50, C.I. Direct Yellow 86, C.I. Direct Yellow 120, C.I. Direct Yellow 132, C.I. Direct Yellow 142, C.I. Direct Yellow 144, C.I. Direct Orange 26, C.I. Direct Orange 29, C.I. Direct Orange 62, C.I. Direct Orange 102, C.I. Basic Yellow 1, C.I. Basic Yellow 2, C.I. Basic Yellow 11, C.I. Basic Yellow 13, C.I. Basic Yellow 14, C.I. Beige Yellow 15, C.I. Basic Yellow 19, C.I. Basic Yellow 21, C.I. Basic Yellow 23, C.I. Basic Yellow 24, C.I. Basic Yellow 25, C.I. Basic Yellow 28, C.I. Basic Yellow 29, C.I. Basic Yellow 32, C.I. Basic Yellow 36, C.I. Basic Yellow 40, C.I. Basic Yellow 41, C.I. Basic Yellow 45, C.I. Basic Yellow 49, C.I. Basic Yellow 51, C.I. Basic Yellow 53, C.I. Basic Yellow 63, C.I. Basic Yellow 64, C.I. Basic Yellow 65, C.I. Basic Yellow 67, C.I. Basic Yellow 70, C.I. Basic Yellow 73, C.I. Basic Yellow 77, C.I. Basic Yellow 87, C.I. Basic Yellow 91, C.I. Reactive Yellow 1, C.I. Reactive Yellow 5, C.I. Reactive Yellow 11, C.I. Reactive Yellow 13, C.I. Reactive Yellow 14, C.I. Reactive Yellow 20, C.I. Reactive Yellow 21, C.I. Reactive Yellow 22, C.I. Reactive Yellow 25, C.I. Reactive Yellow 40, C.I. Reactive Yellow 47, C.I. Reactive Yellow 51, C.I. Reactive Yellow 55, C.I. Reactive Yellow 65, C.I. Reactive yellow 67 and the like can be used.

As a magenta water-soluble dye, it is C.I. Acid red 1, C.I. Acid red 8, C.I. Acid red 13, C.I. Acid red 14, C.I. Acid red 18, C.I. Acid red 26, C.I. Acid red 27, C.I. Acid red 35, C.I. Acid red 37, C.I. Acid red 42, C.I. Acid red 52, C.I. Acid red 82, C.I. Acid red 87, C.I. Acid red 89, C.I. Acid red 92, C.I. Acid red 97, C.I. Acid red 106, C.I. Acid red 111, C.I. Acid red 114, C.I. Acid red 115, C.I. Acid red 134, C.I. Acid red 186, C.I. Acid red 249, C.I. Acid red 254, C.I. Acid red 289, C.I. Food Red 7, C.I. Food Red 9, C.I. Food Red 14, C.I. Direct Red 1, C.I. Direct Red 4, C.I. Direct Red 9, C.I. Direct Red 13, C.I. Direct Red 17, C.I. Direct Red 20, C.I. Direct Red 28, C.I. Direct Red 31, C.I. Direct Red 39, C.I. Direct Red 80, C.I. Direct Red 81, C.I. Direct Red 83, C.I. Direct Red 89, C.I. Direct Red 225, C.I. Direct Red 227, C.I. Basic Red 2, C.I. Basic Red 12, C.I. Basic Red 13, C.I. Basic Red 14, C.I. Basic Red 15, C.I. Basic Red 18, C.I. Basic Red 22, C.I. Basic Red 23, C.I. Basic Red 24, C.I. Basic Red 27, C.I. Basic Red 29, C.I. Basic Red 35, C.I. Basic Red 36, C.I. Basic Red 38, C.I. Basic Red 39, C.I. Basic Red 46, C.I. Basic Red 49, C.I. Basic Red 51, C.I. Basic Red 52, C.I. Basic Red 54, C.I. Basic Red 59, C.I. Basic Red 68, C.I. Basic Red 69, C.I. Basic Red 70, C.I. Basic Red 73, C.I. Basic Red 78, C.I. Basic Red 82, C.I. Basic Red 102, C.I. Basic Red 104, C.I. Basic Red 109, C.I. Basic Red 112, C.I. Reactive Red 1, C.I. Reactive red 14, C.I. Reactive red 17, C.I. Reactive Red 25, C.I. Reactive Red 26, C.I. Reactive Red 32, C.I. Reactive red 37, C.I. Reactive Red 44, C.I. Reactive Red 46, C.I. Reactive Red 55, C.I. Reactive Red 60, C.I. Reactive Red 66, C.I. Reactive Red 74, C.I. Reactive Red 79, C.I. Reactive red 96, C.I. Reactive red 97 and the like can be used.

As the cyan-based water-soluble dye, for example, C.I. Acid blue 9, C.I. Acid blue 29, C.I. Acid blue 45, C.I. Acid blue 92, C.I. Acid blue 249, C.I. Direct Blue 1, C.I. Direct Blue 2, C.I. Direct Blue 6, C.I. Direct Blue 15, C.I. Direct Blue 22, C.I. Direct Blue 25, C.I. Direct Blue 71, C.I. Direct Blue 76, C.I. Direct Blue 79, C.I. Direct Blue 86, C.I. Direct Blue 87, C.I. Direct Blue 90, C.I. Direct Blue 98, C.I. Direct Blue 163, C.I. Direct Blue 165, C.I. Direct Blue 199, C.I. Direct Blue 202, C.I. Basic Blue 1, C.I. Basic Blue 3, C.I. Basic Blue 5, C.I. Basic Blue 7, C.I. Basic Blue 9, C.I. Basic Blue 21, C.I. Basic Blue 22, C.I. Basic Blue 26, C.I. Basic Blue 35, C.I. Basic Blue 41, C.I. Basic Blue 45, C.I. Basic Blue 47, C.I. Basic Blue 54, C.I. Basic Blue 62, C.I. Basic Blue 65, C.I. Basic Blue 66, C.I. Basic Blue 67, C.I. Basic Blue 69, C.I. Basic Blue 75, C.I. Basic Blue 77, C.I. Basic Blue 78, C.I. Basic Blue 89, C.I. Basic Blue 92, C.I. Basic Blue 93, C.I. Basic Blue 105, C.I. Basic Blue 117, C.I. Basic Blue 120, C.I. Basic Blue 122, C.I. Basic Blue 124, C.I. Basic Blue 129, C.I. Basic Blue 137, C.I. Basic Blue 141, C.I. Basic Blue 147, C.I. Basic Blue 155, C.I. Reactive Blue 1, C.I. Basic Blue 2, C.I. Basic Blue 7, C.I. Basic Blue 14, C.I. Basic Blue 15, C.I. Basic Blue 23, C.I. Basic Blue 32, C.I. Basic Blue 35, C.I. Basic Blue 38, C.I. Basic Blue 41, C.I. Basic Blue 63, C.I. Basic Blue 80, C.I. Basic blue 95 etc. can be used.

As the black water-soluble dye, for example, C.I. Acid black 1, C.I. Acid black 2, C.I. Acid black 7, C.I. Acid black 24, C.I. Acid black 26, C.I. Acid black 94, C.I. Food Black 1, C.I. Food Black 2, C.I. Direct Black 19, C.I. Direct Black 22, C.I. Direct Black 32, C.I. Direct Black 38, C.I. Direct Black 51, C.I. Direct Black 56, C.I. Direct Black 71, C.I. Direct Black 74, C.I. Direct Black 75, C.I. Direct Black 77, C.I. Direct Black 154, C.I. Direct Black 168, C.I. Direct Black 171, C.I. Basic Black 2, C.I. Basic Black 8, C.I. Reactive black 3, C.I. Reactive Black 4, C.I. Reactive Black 7, C.I. Reactive black 11, C.I. Reactive Black 12, C.I. Reactive black 17 and the like can be used.

The content of the dye is in the range of 1% by mass to 10% by mass, and more preferably in the range of 3% by mass to 5% by mass relative to the total mass of the ink (2). The content of this dye is determined in consideration of the viscosity, dryness, ejection stability, color development, and storage properties of phosphide of the ink 2.

As a solvent for dissolving or dispersing the above-mentioned dye, a conventionally known organic solvent for the purpose of providing the desired physical properties to the ink other than water, improving the solubility and dispersibility of the dye in water, and preventing the ink from drying. You can use together.

Specifically, as an organic solvent which can be used as a solvent, for example, diethylene glycol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, glycerol, 1,2,6-hexanetriol, 1 Polyhydric alcohols such as 2,4-butanetriol and petriol; polyhydric alcohol allyl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; N-methyl-2-pyrrolidone and N-hydroxy Nitrogen-containing heterocyclic compounds such as ethyl-pyrrolidone, 1,3-dimethylimidazoyridinone, ε-caprolactam, and γ-butyrolactone; formamide, N-methylformamide, N, N-dimethylform Amides such as amides, amines such as monoethanolamine, diethanolamine, triethanolamine, monoethylamine, diethylamine and triethylamine, and sulfur-containing compounds such as dimethyl sulfoxide, sulfolane and thiodiethanol Etc. can be mentioned.

The addition amount of the said organic solvent is the range of 5 mass%-50 mass% with respect to the ink (2) total mass, More preferably, it is the range of 10 mass%-35 mass%, and is the same as the case of a pigment | dye It is determined in consideration of viscosity, dryness and discharge stability.

The ink 2 contains a water-soluble organic solvent for improving the penetration into the recording paper P, in addition to the solvent for dissolving or dispersing the dye described above.

The specific water-soluble organic solvent is a water-soluble organic solvent in which the peak appearance time of the permeation characteristic curve for the recording paper P measured by the ultrasonic permeation dynamic liquid permeability measuring device is in the range of 0.1 second to 0.5 second. Here, the ultrasonic permeation dynamic liquid permeability measuring apparatus is described in, for example, "Paper Wettability Measurements-An Evaluation of Emtec PDA": Examensaebete 1998, Processingenjor Michael Sjogren, and Patent Document DP195 35 954.2. As shown in FIG. 4, the ultrasonic permeable dynamic liquid permeability measuring device 90 includes a sample holder 94 for fixing and immersing the test paper 93 in a container filled with a test liquid between the ultrasonic transmitter 91 and the ultrasonic receiver 92. ) Is installed and made. Specifically, examples of the ultrasonic permeable dynamic liquid permeability measuring device 90 include a dynamic liquid permeability measuring device PDA.C2 (manufactured by Emtec, Germany) and DPM (manufactured by Emco, Germany). have.

In the ultrasonic permeable dynamic liquid permeability measuring device 90, an ultrasonic signal is transmitted from the ultrasonic transmitter 91, and the ultrasonic signal is received by the ultrasonic receiver 92 through the test paper 93 immersed in the test liquid. Accordingly, in the ultrasonic permeation type dynamic liquid permeability measuring device 90, the transmission intensity of the ultrasonic wave in the process of penetrating the test liquid into the test paper 93, that is, the received signal intensity (%) received by the ultrasonic receiver 92 over time is neglected. Can be measured as In the ultrasonic permeable dynamic liquid permeability measuring device 90, the measured signal intensity (%) of the ultrasonic receiver 92 in the course of penetrating the test liquid into the test paper 93 is measured as shown in FIG. A penetration characteristic curve showing the relationship between the immersion time for the test liquid of the test paper 93 and the received signal intensity (%) of the ultrasonic receiver 92 is obtained, and from this curve, the characteristic of the permeability to the test paper 93 of the test liquid is obtained. Can be.

Specifically, in this penetration characteristic curve, the peak appearance time at which the peak P appears is a time required from immediately after the test paper 93 is immersed in the test liquid until the ultrasonic receiving intensity becomes maximum. Here, the state when the received signal intensity (%) of the ultrasonic receiver 92 is the maximum is a state in which the effect of the sizing agent added in the test paper 93 is reduced, and the test liquid starts to penetrate into the cellulose fiber. . Therefore, the peak appearance time of the permeation characteristic curve is the time at which the test solution starts permeation into the cellulose fiber.

Here, using the water-soluble organic solvent contained in the ink 2 as a test liquid, the time which starts penetration into the cellulose fiber of the plain paper used as the test paper 93 on the following measurement conditions is measured. Specific measurement conditions are performed in an environment of a temperature of 25 ° C. and a humidity of 60% RH using the PDA.C2 (manufactured by Mtek Co., Ltd.) standard module in the ultrasonic permeable dynamic liquid permeability measuring device 90. Plain paper is sufficiently controlled in an environmental condition of a temperature of 25 ° C. and a humidity of 60% RH, and a Cobb ₃₀ value specified in JIS P8140: 1998 is 22 ± 2 g / m ² . Specific examples of this paper include Mitsubishi PPC paper: Mitsubishi Paper Co., Cobb ₃₀ = 21.6 g / m ² (average of front and back). As a result of investigation by the present inventors, the Cobb ₃₀ value of the commercially available plain paper has a wide range from the high thing which exceeds 60 g / m <^2> to about 15 g / m <^2> , but is about 20-24 g / m <^2> . It has been found that the Cobb size is often represented, and border bleeding and mixed solid staining are likely to occur. As a water-soluble organic solvent, what was adjusted to 25 degreeC as the aqueous solution of 2 weight% concentration is used. Here, the reason for setting it as 2 weight% is to dilute water for the purpose of removing the influence of the other viscosity which each water-soluble organic solvent shows, and the viscosity will be about 1.8 cP. By measuring on such measurement conditions, the characteristic of permeability to the plain paper of the water-soluble organic solvent can be known from the measurement result.

In the ink 2, as a result of the measurement under the measurement conditions described above, a water-soluble organic solvent having a peak appearance time in the range of 0.1 seconds to 0.5 seconds is used. As such a water-soluble organic solvent, there exists a compound represented by following formula (1), for example.

In the formula, R ₁ and R ₂ each represent an aliphatic saturated hydrocarbon group, 3 ≦ R ₁ + R ₂ ≦ 4, and R ₁ , R ₂ ≧ ₁ .

Specifically, as a water-soluble organic solvent, there is a compound shown in Table 1 below. In addition, it is not limited to what is shown in Table 1 as a water-soluble organic solvent, The peak appearance time for the plain paper whose Cobb ₃₀ value prescribed | regulated to JIS P8140: 1998 is 22 +/- 2 g / m <^2> in the said measurement conditions is 0.1 second or more and 0.5. It is desirable to fall within the range of seconds or less.

Here, boundary bleeding or mixed solid stains seen when printed on plain paper are caused by the ink 2 diffusing and penetrating only along the cellulose fibers while avoiding the sizing agent. In the ink 2, in order to prevent this boundary bleeding and mixed solid staining from occurring, if the surface is excessively wet and penetrated to the sizing agent surface, the bleeding in the depth direction to the recording paper P becomes too large and the print density is lowered. , Image reflection occurs.

Therefore, the ink 2 contains an organic water-soluble solvent having a peak appearance time of 0.1 seconds to 0.5 seconds for a plain paper having a Cobb ₃₀ value defined in JIS P8140: 1998 as shown in Table 1 of 22 ± 2 g / m ² . By doing so, it is added to the plain paper, sufficiently wets the surface of the sizing agent that imparts water resistance, and all of the cellulose fibers are uniformly penetrated. Accordingly, in the ink 2, it is possible to prevent boundary bleeding, mixed color solid staining, and shining, without diffusing and penetrating along the cellulose fibers while avoiding the sizing agent. In addition, in the ink 2, since it penetrates uniformly with respect to the plain paper, a high ignition concentration can be obtained.

In the water-soluble organic solvent in which the peak appearance time of the permeation characteristic curve is faster than 0.1 second, the penetration of the ink 2 into the plain paper becomes too high and light shining easily occurs. As a water-soluble organic solvent whose peak appearance time is faster than 0.1 second, for example, 2,4-diethyl-1,5-pentanediol is 0.036 second, 2-ethyl-1,3-hexanediol is 0.036 second, Propyl alcohol is 0.03 seconds.

On the other hand, when the peak appearance time of the penetration characteristic curve is slower than 0.5 second, the penetration of the ink 2 into the plain paper becomes poor and bleeds. As a water-soluble organic solvent whose peak appearance time is slower than 0.5 second, for example, 2-methyl-2,4-pentanediol is 0.54 second, 1,3-butanediol is 0.56 second, ethylene glycol is 0.59 second, and glycerin is 0.69 seconds and 2-pyrrolidone is 0.62 seconds.

Moreover, as a water-soluble organic solvent whose peak appearance time of a penetration characteristic curve is slower than 0.5 second, it is a C7 alkylene glycol in order to improve ink quality by improving ink penetration into a plain paper as described in Unexamined-Japanese-Patent No. 2894568. For example 1,7-heptanediol or 3,3-dimethyl-1,5-pentanediol. 1,7-heptanediol has a peak appearance time of 0.53 seconds and 3,3-dimethyl-1,5-pentanediol has a 0.52 second. Since such a water-soluble organic solvent also has a peak appearance time slower than 0.5 seconds, it is impossible to improve the system to sufficiently satisfy all problems such as border bleeding, mixed color solid staining, print density, and image reflecting. Therefore, the ink 2 contains a water-soluble organic solvent having a peak appearance time of 0.1 sec. To 0.5 sec. In the permeation characteristic curve, whereby the ignition concentration is high, and boundary bleeding, mixed color solid staining and shining can be prevented.

Content of the water-soluble organic solvent in the ink (2) is 0.1-10 mass%, More preferably, it is 0.5-7 mass%. When content is less than 0.1 mass%, an addition effect will not be acquired. On the other hand, when content is more than 10 mass%, a viscosity increase or undissolved powder may generate | occur | produce, and it may affect intermittent discharge property.

Moreover, it is most preferable to make content of the water-soluble organic solvent into content which makes the 0 second dynamic surface tension of the ink 2 into the range of 35 mN / m or more and 40 mN / m or less. In the ink 2, the 0 second dynamic surface tension is in the range of 35 mN / m or more and 40 mN / m or less, so that the penetration into the recording paper P becomes better, the print density is high, boundary smearing, mixed solid stains, It is possible to prevent shining more. Specifically, it is determined by a combination with other solvents and the like used in combination. For example, 2-ethyl-2-propyl-1,3-propanediol and 2-propyl-1,4-butanediol are 0.1 to 1%, 2 -Methyl-2-butyl-1,3-propanediol is 1 to 3%, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol and 2- Methyl-2-ethyl-1,3-propanediol is 2 to 10%.

Here, the 0 second dynamic surface tension will be described. For the relaxation function of the dynamic surface tension-time change of the liquid containing the surfactant represented by the following formula (1), see, for example, Hua X. Y, Rosen M. J: J. Colloid Interface Sci. 124, 652 (1988)] and Tamak Takamitsu: Surface Vol. 38 No. 10 22 to 44 (2000).

(Wherein γ _m is the surface tension when the surface tension change for 30 seconds is 1 mN / m or less, γ ₀ is the surface tension of the solvent, and t ^* is γ _t and γ _o and is the time when γ _m is in the middle, and n is a constant.)

In the formula, γ ₃₀ is the surface tension when the surface tension change for 30 seconds is 1 mN / m or less, γ ₀ is the surface tension of the solvent, t ^* is γ _t and γ _o and It is time when it becomes the middle of (gamma) _m , and n is a constant.

The relaxation function formula of the dynamic surface tension-time change of the liquid containing the surfactant shown by the above formula 1 proposed by Rosen is represented by the following formula (2).

As shown in Equation 2, the zero-second dynamic surface tension is water and organic except for the components having the surface-active properties such as pigments, preservatives, flavoring agents, dispersants, penetrants, surfactants, and the like from the ink (2). It can obtain | require by measuring the static surface tension of the solvent containing a solvent. In addition, when the dynamic surface tension of the solvent of the ink 2 is continuously measured by changing the speed at which bubbles are generated, for example, the bubble speed, by the maximum bubble pressure method, specifically, the bubble speed is 20 bubbles / sec. In the case of continuous measurement in the range of from 0.1 to 0.1 bubbles / second, the dynamic surface tension curve becomes almost horizontally straight, and the dynamic surface tension curve does not drop significantly even when the bubble velocity decreases.

Here, when the zero second dynamic surface tension of the ink 2 is less than 35 mN / m, the ink 2 hitting the recording paper P is in the depth direction of the recording paper P, that is, in the thickness direction of the recording paper P. There is a possibility that the ink 2 may seep out to the back side of the recording paper P due to excessive penetration of the printing density. On the other hand, when the 0 second dynamic surface tension of the ink 2 exceeds 40 mN / m, the soaking in the thickness direction of the recording paper P may be slow and feathering may occur. In particular, in the case where the 0 second dynamic surface tension is 45 mN / m or more, feathering and shining become remarkable.

In addition to the dye, the solvent, and the water-soluble organic solvent, the ink 2 additionally contains an ethylene oxide adduct of 2-ethyl-2-butyl-1,3-propanediol represented by the following formula (2) as a surfactant (hereinafter, Higher quality printing can be performed by containing "EBPD-EO" and making static surface tension into 34 mN / m or more and 39 mN / m or less.

In formula, m and n are integers of 0-10, respectively, and satisfy | fill 1 <= m + n <= 10.

The amount of EBPD-EO added is in the range of 0.05% by mass to 5% by mass, more preferably in the range of 0.1% by mass to 2% by mass relative to the total mass of the ink (2). If the addition amount is less than 0.05% by mass, the addition effect is not obtained. On the other hand, when it exceeds 5 mass%, the viscosity of the ink 2 may be too high, on the contrary, discharge stability may be impaired and the permeability to recording paper P may be slowed.

Also, in the ink 2, when the static surface tension is less than 34 mN / m, when the recording paper P is landed, the ink concentration excessively penetrates into the depth direction of the recording paper P, that is, the thickness direction of the recording paper P, or the print density decreases. The ink 2 may leak out to the back side of the recording paper P. When the static surface tension exceeds 45 mN / m, the penetration of the recording paper P in the thickness direction is slow, and feathering or the like may occur. The measurement method of surface tension follows the Wilhelmi (plate) method.

In addition, a conventionally well-known surfactant can also be added to the ink 2 in the range which does not inhibit the effect of water-soluble organic solvent, surfactant, etc. which were mentioned above. Specifically, conventionally known surfactants include, for example, special phenolic nonionic surfactants such as polycyclic phenol ethoxylates, ethylene oxide adducts of glycerite, polyethylene glycol oleate, polyoxyalkylentalate, Ester nonionic surfactants, such as sorbitan lauryl ester, sorbitan oleyl ester, and polyoxyethylene sorbitan oleyl ester, and amide type nonionics, such as palm oil fatty acid diethanolamide and polyoxyethylene palm oil fatty acid monoethanolamide Anionic surfactants such as surfactants, acetylene glycol and ethylene oxide adducts thereof, alcohol sulfate sodium salts, higher alcohol sulfate sodium salts, polyoxyethylene alkylphenyl ether sulfate ammonium salts and alkyl benzene sulfonate salts; Mono long chain alkyl cation, long chain dialkyl cation, alkylamine jade Cationic surfactants such as DE or, La and lauryl amido and the like ampholytic surface active agents such as the propyl acetate betaine, lauryl amino acid betaine, those conventionally known surfactants can be used singly or in combination.

In addition, the ink 2 can also be added, for example, a viscosity regulator, a pH regulator, a preservative, a rust preventive agent, a preservative, and the like. Specifically, examples of the viscosity regulator and the pH regulator include proteins such as gelatin and casein, natural rubber such as gum arabic, cellulose derivatives such as methyl cellulose, carboxymethyl cellulose and hydroxymethyl cellulose, lignin sulfonate and shellac. Natural polymers, polyacrylates, styrene-acrylic acid copolymer salts, polyvinyl alcohol, polyvinylpyrrolidone, and the like, and these may be used alone or in combination. Moreover, as an antiseptic, a rust preventive, an antiseptic etc., benzoic acid, dichlorophene, hexachlorophene, sorbic acid, p-hydroxy benzoic acid ester, ethylenediamine tetraacetic acid (EDTA), etc. are mentioned, for example, These are single or mixed. Can be used.

When manufacturing the ink 2 of the above structure, the peak appearance time with respect to the pigment | dye mentioned above, the solvent, and the plain paper whose Cobb ₃₀ value prescribed | regulated to JIS P8140: 1998 is 22 +/- 2 g / m <^2> is 0.1 second or more. A water-soluble organic solvent of 0.5 seconds or less and, optionally, EBPD-EO represented by the above-described formula (2) as a surfactant may be mixed at a predetermined blending ratio, and stirred with a screw or the like while heating to room temperature or from 40 ° C to 80 ° C. It can manufacture by dispersing.

2 and 3, yellow ink is contained in the ink tank 5y, magenta ink is contained in the ink tank 5m, and cyan ink is contained in the ink tank 5c. Is accommodated in the ink tank 5k.

Next, the head cartridge 3 which can be attached and detached with respect to the apparatus main body 2 which comprises the above-mentioned printer apparatus 1, and the ink tank 5y, 5m, 5c, 5k which can be attached or detached with respect to this head cartridge 3 are performed. ) Will be further described with reference to the drawings.

As shown in FIG. 1, the head cartridge 3 which prints on the recording paper P is mounted on the upper surface side of the apparatus main body 4, that is, in the direction of arrow A in FIG. 2) is discharged and printing is performed.

The head cartridge 3 finely granulates and discharges the ink 2 by, for example, a pressure generated by a pressure generating means using an electrothermal conversion type or an electromechanical conversion type, and droplets on the main surface of the recording paper P. The ink 2 in the state is sprayed. Specifically, the head cartridge 3 has a cartridge body 21, as shown in Figs. 2 and 3, and the ink tanks 5y, 5m, which are containers in which the ink 2 is filled in the cartridge body 21; 5c, 5k). In addition, below, the ink tank 5y, 5m, 5c, 5k is also called the ink tank 5 only.

The ink tank 5 detachable from the head cartridge 3 has a tank main body 11 that is molded by injection molding a resin material such as polypropylene having strength and ink resistance. This tank main body 11 is formed in the substantially rectangular shape which has the dimension substantially the same as the dimension of the width direction of the recording paper P which uses the longitudinal direction.

Specifically, the tank main body 11 constituting the ink tank 5 includes an ink container 12 containing ink 2 and a cartridge body 21 of the head cartridge 3 from the ink container 12. ), An ink supply unit 13 for sending ink 2 is provided.

The ink receiving portion 12 is provided with an external communication hole 14 that becomes a hole when external air is blown in to the upper surface center portion. The ink container 12 can blow air into the inside through the air inlet pipe 15 extending inwardly from the external communication hole 14. In the ink tank main body 11, when the ink 2 in the ink containing part 12 is sent out from the ink supply part 13 to the cartridge main body 21, the ink 2 in this ink containing part 12 is reduced. Air equivalent to minutes is blown into the ink containing portion 12 through the air inlet pipe 15 from the external communication hole 14.

In the middle portion of the air inlet pipe 15, a liquid storage for temporarily storing the ink 2 so that the ink 2 flowing back from the ink containing portion 12 does not suddenly flow out of the external communication hole 14 to the outside. The denial ink reservoir 16 is provided. Accordingly, in the ink tank 5, the ink storage unit 16 temporarily stores the ink 2 that has flowed back through the air inlet pipe 15 from the ink receiving unit 12, thereby releasing from the external communication hole 14. The ink 2 does not leak to the outside, and the ink 2 can be returned to the ink containing portion 12 side again.

The ink supply part 13 is provided in the substantially center part of the lower side of the ink accommodating part 12. As shown in FIG. This ink supply part 13 is a nozzle of the substantially protruding shape which communicated with the ink containing part 12, and the tip of this nozzle is fitted to the connection part 27 of the head cartridge 3 mentioned later, The tank main body 11 and the cartridge main body 21 of the head cartridge 3 are connected.

The ink supply part 13 is provided with a supply port for supplying the ink 2 to the cartridge main body 21 side on the bottom face side of the ink tank 5. At the bottom of the ink tank 5, a valve mechanism for opening and closing the supply port is provided. In the supply port, the valve closes the supply port in a step before the ink tank 5 is attached to the cartridge body 21, and the ink 2 is prevented from leaking from the ink tank 5. Moreover, when the ink tank 5 is attached to the cartridge main body 21, the valve will be separated from the supply port, open the supply port, and it will be in the state which can supply the ink 2 to the head cartridge 3 side.

In addition, the ink tank main body 11 has a latch projection 17 and a joining end 18, which are fixing means for fixing to the mounting portion 22 of the cartridge main body 21 described later. The latch protrusion 17 is a protrusion formed from a side portion on the other end side in the long side direction of the ink tank 5, and is joined to the latch lever 25 of the mounting portion 22 described later. The bonding end 18 is a stepped portion formed on one end side in the long side direction of the ink tank 5, and is joined to the joined portion 26 formed on the side of the mounting portion 22 described later. By this latch protrusion 17 and the bonding end 18, the ink tank 5 is fixed to the cartridge main body 21, and is mounted.

The ink tank 5 having the above-described configuration is, in addition to the above-described configuration, for example, a remaining amount detection section for detecting the remaining amount of the ink 2 in the ink containing portion 12, or the ink tanks 5y, 5m, 5c, 5k. And an identification unit for identifying the unit.

Next, the head cartridge 3 to which the ink tank 5y, 5m, 5c, 5k which accommodated the ink 2 of yellow, magenta, cyan, and black comprised as mentioned above is mounted is demonstrated.

As shown in Figs. 2 and 3, the head cartridge 3 is constituted by the ink tank 5 and the cartridge main body 21, and the mounting portion 22y in which the ink tank 5 is mounted on the cartridge main body 21 is mounted. , 22m, 22c, 22k (hereinafter, simply referred to as the mounting portion 22 in the following description), the ink discharge head 23 for discharging the ink 2, and the head cap for protecting the ink discharge head 23. Has 24.

The mounting portion 22 on which the ink tank 5 is mounted is formed in a substantially concave shape, and four ink tanks 5 are arranged substantially in a direction perpendicular to the width direction of the recording paper P, that is, in the traveling direction of the recording paper P. It is stored lined up. As shown in Fig. 2, the bottom surface of the mounting portion 22 is provided with partition walls 22a for partitioning the ink tanks 5y, 5m, 5c, and 5k of each color, respectively, and the ink tanks 5y, 5m, 5c, and 5k of each color. Installed between).

When the ink tank 5 is mounted on the mounting portion 22, a latch lever 25 is provided on a side surface of the ink tank 5 that faces the latch protrusion 17, and the latch hole formed in the latch lever 25 is provided. The latch protrusion 17 is caught by 25a. Moreover, the to-be-joined part 26 is provided in the mounting part 22 in the side surface which opposes the junction end 18 of the ink tank 5, and this to-be-joined part 26 is joined with the junction end 18. As shown in FIG. The mounting portion 22 catches the latch protrusion 17 of the ink tank 5 and the latch hole 25a of the latch lever 25, and the joining end 18 and the joined portion 26 are joined to each other so that the ink tank 2 Is fixed and mounted.

When the ink tanks 5y, 5m, 5c, and 5k are attached to the mounting portions 22y, 22m, 22c, and 22k at approximately the center in the longitudinal direction of each of the mounting portions 22y, 22m, 22c, and 22k, the ink tanks 5y, The connection part 27 to which the ink supply part 13 of 5m, 5c, 5k is connected is provided. This connection portion 27 is provided with an ink (e.g., an ink discharge head 23 for discharging ink 2 provided on the bottom surface of the cartridge body 21 from the ink supply portion 13 of the ink tank 5 mounted on the mounting portion 22). It becomes an ink supply path which supplies 2).

The connection part 27 seals the ink storage part 31 which stores the ink 2 supplied from the ink tank 5, and the ink supply part 13 connected to the connection part 27, as shown in FIG. It has the sealing member 32, the filter 33 which removes the impurity in the ink 2, and the valve mechanism 34 which opens and closes the supply path to the ink discharge head 23 side.

The ink storage part 31 is a space part which is connected to the ink supply part 13 and stores the ink 2 supplied from the ink tank 5. The sealing member 32 is a member provided on the upper end of the ink storage portion 31, and when the ink supply portion 13 of the ink tank 5 is connected to the ink storage portion 31 of the connecting portion 27, the ink 2 ) Is sealed between the ink storage portion 31 and the ink supply portion 13 so as not to leak outside. The filter 33 removes dirt, such as garbage and dust, which are mixed in the ink 2 when the ink tank 5 is attached or detached, and is installed downstream from the ink storage unit 31.

When the ink mechanism 2 is discharged from the nozzle 42a of the ink discharge head 23, which will be described later, the valve mechanism 34 opens a valve (not shown) due to the negative pressure generated on the ink discharge head 23 side. The ink 2 is supplied from the ink containing portion 12 of the tank 5 to the ink discharge head 23. Moreover, the valve mechanism 34 supplies ink 2 from the ink container 12 of the ink tank 5 to the ink discharge head 23, and the pressure on the ink discharge head 23 side returns to a normal state. When the mask is closed, the supply of the ink 2 from the ink containing portion 12 of the ink tank main body 11 to the ink discharge head 23 is stopped.

The connection part 27 which consists of a structure as mentioned above performs the supply operation | movement of the ink 2 by the valve mechanism 34 every time it discharges the ink 2 from the nozzle 42a of the ink discharge head 23 mentioned later. Repeat. On the other hand, in the ink tank 5, when the ink 2 in the ink containing portion 12 is supplied to the valve mechanism 34 side in conjunction with the supply operation of the ink 2 by the valve mechanism 34 described above. At the same time as the ink 2 in the ink containing portion 12 is reduced, air corresponding to the reduced ink 2 is introduced into the ink containing portion 12 from the external communication hole 14 through the air introduction pipe 15. Is introduced. Thereby, the ink 2 can be appropriately supplied to the ink discharge head 23 side while maintaining the pressure in the ink containing portion 12 in an equilibrium state.

The ink discharge head 23 is arranged along the bottom surface of the cartridge body 21 as shown in FIG. 6, and is a nozzle 42a described later, which is an ink discharge port for discharging ink droplets i supplied from the connecting portion 27. ) Is substantially line-shaped in the width direction of the recording paper P, i.e., the arrow W in FIG.

The head cap 24 is a cover provided to protect the ink discharge head 23, as shown in Fig. 2, and withdraws from the ink discharge head 23 during the printing operation. The head cap 24 has a pair of bonding protrusions 24a provided in the opening and closing directions at both ends of the arrow W direction in FIG. 2, and an extra portion provided in the longitudinal direction and attached to the discharge surface 23a of the ink discharge head 23. It has a cleaning roller 24b which absorbs the ink 2 of the ink. The head cap 24 is joined to a pair of joining grooves 23b in which a joining protrusion 24a is provided on the ejection surface 23a of the ink ejecting head 23 in a direction substantially orthogonal to the arrow W direction in FIG. 2, It opens and closes along the pair of joining grooves 23b in a direction substantially perpendicular to the shorter direction of the ink tank 5, that is, the arrow W direction in FIG. Further, in the head cap 24, the cleaning roller 24b rotates while being in contact with the discharge surface 23a of the ink discharge head 23 during the opening and closing operation to absorb the extra ink 2, thereby allowing the ink discharge head. The discharge surface 23a of 23 is cleaned. As this cleaning roller 24b, a member with high hygroscopicity, specifically, a sponge, a nonwoven fabric, a woven fabric, etc. are used. In addition, the head cap 24 closes the discharge surface 23a so that the ink 2 in the ink discharge head 23 is not dried when the printing operation is not performed.

As shown in FIG. 7, the ink discharge head 23 includes a circuit board 41 serving as a base, a nozzle sheet 42 on which a plurality of nozzles 42a are formed, a circuit board 41, and a nozzle sheet 42. The film 43 which partitions between nozzles 42a, the ink liquid chamber 44 which pressurizes the supplied ink 2, and the pressure generation element which heats the ink 2 supplied to the ink liquid chamber 44 are The heat generating resistor 45 is provided, and the ink flow passage 46 for supplying the ink 2 to the ink liquid chamber 44 is provided.

The circuit board 41 forms a control circuit including a logic IC (Integrated Circuit), a driver transistor, and the like on a semiconductor wafer containing silicon and the like, and forms an upper surface portion of the ink liquid chamber 44.

The nozzle sheet 42 is a sheet-like member having a thickness of about 10 μm to 15 μm, the diameter of which is reduced toward the discharge surface 23a, and the nozzle being a discharge port having a diameter of about 20 μm on the discharge surface 23a side ( 42a) is formed and the circuit board 41 and the film 43 are sandwiched so as to face each other, thereby forming the lower surface portion of the ink liquid chamber 44.

The film 43 includes, for example, an exposure-curable dry film resist, and is formed so as to surround the periphery of each nozzle 42a except for a portion in communication with the connecting portion 27. In addition, the film 43 is interposed between the circuit board 41 and the nozzle sheet 42 to form the side surface portion of the ink liquid chamber 44.

The ink liquid chamber 44 is surrounded by the circuit board 41, the nozzle sheet 42, and the film 43 to form a pressurized space for pressurizing the ink 2 supplied for each nozzle 42a.

The heat generating resistor 45 is disposed on the circuit board 41 facing the ink liquid chamber 44 and is electrically connected to a control circuit and the like provided on the circuit board 41. The heat generating resistor 45 generates heat by being controlled by a control circuit or the like to heat the ink 2 in the ink liquid chamber 44.

The ink flow path 46 is a supply part which is connected to the connection part 27 and supplies the ink 2 to the ink liquid chamber 44 from the ink tank 5 connected to the connection part 27. That is, the ink flow passage 46 and the connection portion 27 communicate with each other. Thereby, the ink 2 supplied from the ink tank 5 flows into the ink flow path 46 and is filled in the ink liquid chamber 44.

One ink discharge head 23 described above is provided with a heat generating resistor 45 for each ink liquid chamber 44, and 100 ink liquid chambers 44 provided with a heat generating resistor 45 for each color ink tank 5. About 5000 is provided. In the ink discharge head 23, each of the heat generating resistors 45 of the ink liquid chambers 44 is appropriately selected to generate heat by a command from a control unit described later in the printer apparatus 1, and the heat generating resistors generate heat. The ink 2 in the ink liquid chamber 44 corresponding to 45 is discharged as the ink droplet i from the nozzle 42a corresponding to the ink liquid chamber 44. When the ink ejecting head 23 ejects the ink droplet i to the recording sheet P, the ink droplet i reaches the recording sheet P to form an image.

Specifically, in the ink discharge head 23, the control circuit of the circuit board 41 drives and controls the heat generating resistor 45, and, for example, about 1 to 3 microseconds with respect to the selected heat generating resistor 45. Supply an intermittent pulse current. As a result, the heat generating resistor 45 is rapidly heated in the ink discharge head 23. Then, in the ink discharge head 23, as shown in FIG. 8A, a bubble b is generated in the ink 2 in the ink liquid chamber 44 in contact with the heat generating resistor 45. As shown in FIG. In addition, in the ink discharge head 23, as shown in FIG. 8B, the bubble 2 is expanded in the ink liquid chamber 44 to pressurize the ink 2, and the pushed out ink 2 is the ink droplet ( i) and discharged from the nozzle 42a. In the ink ejection head 23, after the ink droplet i is ejected, the ink 2 is supplied to the ink liquid chamber 44 through the connecting portion 27, thereby returning to the state before ejection again.

Next, the apparatus main body 4 which comprises the printer apparatus 1 to which the head cartridge 3 comprised as mentioned above is mounted is demonstrated with reference to drawings.

As shown in Figs. 1 and 9, the apparatus main body 4 includes a head cartridge mounting portion 51 to which the head cartridge 3 is mounted, and a head cartridge mounting portion 51 for holding and fixing the head cartridge 3 to the head cartridge mounting portion 51. The recording paper (P) is used for the head cartridge holding mechanism (52), the head cap opening and closing mechanism (53) for opening and closing the head cap, the paper feeding mechanism (54) for feeding and discharging the recording paper (P), and the paper feeding mechanism (54). And a paper feeding port 55 for supplying the paper, and a paper discharge port 56 through which the recording paper P is output from the paper feeding mechanism 54.

The head cartridge mounting portion 51 is a concave portion in which the head cartridge 3 is mounted, and in order to print as data on the traveling recording paper as the data, the discharge surface 23a of the ink ejection head 23 and the recording paper P traveling. The head cartridge 3 is mounted so that the grounds thereof are approximately parallel to each other. In addition, there is a case where the head cartridge 3 needs to be replaced due to clogging of the ink in the ink ejecting head 23 or the like, and the head cartridge mounting portion 51 is not a replacement frequency as the ink tank 5 but is a consumable item. It is held by the head cartridge holding mechanism 52 so that attachment and detachment are possible.

The head cartridge holding mechanism 52 is a mechanism for detachably holding the head cartridge 3 to the head cartridge mounting portion 51 so that the head cartridge 3 is detachably attached to the head cartridge mounting portion 51. The head cartridge 3 can be positioned, held, and fixed by pressing it with a pressing member such as a spring (not shown) installed in the latch hole 52b to be pressed against the reference surface 4a provided in the apparatus main body 4. do.

The head cap opening / closing mechanism 53 has a drive section for opening and closing the head cap 24 of the head cartridge 3, and when the printing is performed, the head cap 24 is opened so that the ink discharge head 23 is applied to the recording paper P. To protect the ink ejection head 23 by closing the head cap 24 when printing is finished.

The paper feeding mechanism 54 has a drive portion for conveying the recording paper P, conveys the recording paper P supplied from the paper feeding port 55 to the ink discharge head 23 of the head cartridge 3, and the nozzle 42a. Ink droplet (i) discharged from the above) is landed, and the printed recording paper (P) is conveyed to the discharge port 56 and discharged to the outside of the apparatus. Specifically, the paper feeding mechanism 54 draws out the recording paper P from the tray 55a by the paper feed roller 71, and the recording paper taken out by a pair of separation rollers 72a and 72b that rotate in opposite directions. (P) After conveying one sheet with the reversing roller 73 to reverse the conveying direction, the recording sheet P is conveyed to the conveyance belt 74, and the recording sheet P is conveyed from the conveying belt 74 to the ink discharge head 23. FIG. It returns to the position opposite to. The paper feed opening 55 is an opening for supplying the recording paper P to the paper feeding mechanism 54, and a plurality of recording papers P can be stacked on the tray 55a or the like. The discharge port 56 is an opening in which the ink droplet i is landed and discharges the printed recording paper P. FIG.

In the printer apparatus 1 having the above-described configuration, printing is controlled by a control circuit (not shown in detail) that controls printing based on print data input from an information processing apparatus provided externally. Specifically, the printer apparatus 1 drives the belt elevating mechanism for elevating the head cap opening / closing mechanism 53, the feeding and discharging mechanism 54, and the conveyance belt 74 of the above-described apparatus main body 4 provided in the control circuit, It is controlled by the control part which controls supply of the electric current supplied to the ink discharge head 23, respectively. When printing, the printer apparatus 1 operates as follows by a control part and performs printing.

First, in order for a user to execute a printing operation to the printer apparatus 1, the control button 3a provided in the apparatus main body 4 is operated to instruct a control part to start printing. In the printer device 1, when a print start command is given to the control unit, the head cap opening / closing mechanism 53, the paper feeding mechanism 54, the belt lifting mechanism, and the like are driven in accordance with the control signal from the control unit, as shown in FIG. It becomes possible to print together.

The head cap opening / closing mechanism 53 drives the drive section and moves the head cap 24 to the tray 55a side with respect to the head cartridge 3. Thus, in the printer apparatus 1, the nozzle 42a of the ink ejection head 23 is exposed to the outside.

The paper feeding mechanism 54 drives the driving portion to drive the recording paper P. FIG. Specifically, the paper feeding mechanism 54 draws out the recording paper P from the tray 55a by the paper feed roller 71, and the recording paper drawn out by the pair of separation rollers 72a and 72b rotating in opposite directions. After conveying P by the inversion roller 73 and inverting a conveyance direction, conveying the recording paper P to the conveyance belt 74, and conveying the recording paper P conveyed by the conveyance belt 74 with the discharge surface 23a. It conveys to the opposite position.

The belt elevating mechanism raises the conveyance belt 74 so that the conveyance belt 74 is substantially parallel with the discharge surface 23a of the ink discharge head 23.

Next, in the printer apparatus 1, the electric current supplied to the heat generating resistor provided in the ink discharge head 23 is controlled by the control part based on the print data input from the external information processing apparatus. Accordingly, in the printer apparatus 1, the heat generating resistor is heated based on the print data input from the information processing apparatus, and ejects the ink droplet i from the nozzle 42a with respect to the recording paper P conveyed to the printing position, It lands and prints the image, character, etc. which consist of ink dots.

In addition, in the printer apparatus 1, when the ink droplet i is discharged from the nozzle 42a, the same amount of ink 2 as the discharged ink droplet i is discharged from the ink tank 5 through the connecting portion 27. The ink liquid chamber 44 is replenished. In the ink discharge head 23, the ink 2 is replenished from the ink tank 5 into the ink liquid chamber 44 every time the ink droplet i is discharged.

Next, in the printer apparatus 1, the conveyance belt 74 of the paper feeding mechanism 54 is driven by a control part, and the recording paper P which printing was complete | finished is discharged | emitted from the discharge port 56. FIG.

As described above, in the printer apparatus 1, the nozzles 42a for discharging the ink 2 are arranged in the width direction of the recording paper P for each color, and when printing, the nozzles (parallel to the width of the recording paper P) ( Since the ink 2 is discharged in every line of 42a), the head is not moved in the width direction of the recording paper P like the serial printer apparatus. As a result, in the printer apparatus 1, the ejection interval of the ink 2 in each row is shortened, and the printing time per sheet of recording paper P is shortened in comparison with the serial printer apparatus.

In such a printer device 1, the peak appearance time of the penetration characteristic curve for the plain paper having Cobb ₃₀ value of 22 ± 2 g / m ² specified in JIS P8140: 1998 in the ink 2 used is 0.1 second to 0.5 second. The following organic water-soluble solvent is contained. Accordingly, in the printer apparatus 1, even if the ejection period of the ink 2 is made very short and the ink 2 is discharged in sequence, the ink 2 that has landed on the recording paper P is a fiber such as cellulose of the recording paper P. And since it penetrates uniformly on the surface of the added sizing agent, boundary spreading, mixed solid stain, and shining can be prevented. In the printer apparatus 1, since the ink 2 penetrates uniformly into the recording paper P, a high print density is obtained.

Moreover, in the printer apparatus 1, since the above-mentioned organic water-soluble solvent is contained in the ink 2, ignition density is high and it can prevent boundary bleeding, mixed color solid stain, and shining. Therefore, in the printer apparatus 1, even if ink jet recording paper is used, the ink 2 penetrates uniformly and has a high print density, and it is possible to prevent boundary bleeding, mixed color solid staining and shining, thereby forming a high quality image. .

In addition, in the printer apparatus 1, since the 0 second dynamic surface tension of the ink 2 is made into the range of 35 mN / m or more and 40 mN / m or less by adjusting the addition amount of the above-mentioned organic water-soluble solvent, a ignition density is high, It is possible to form an image in which boundary bleeding, mixed color solid staining and reflection are prevented.

In addition, in the printer device 1, EBPD-EO is contained in the ink 2 as a surfactant in addition to the water-soluble organic solvent, and the static surface tension is 34 mN / m or more and 39 mN / m or less. Can be printed.

As mentioned above, although the example which applied this invention to the printer apparatus was demonstrated, this invention is not limited to the above example, It is possible to apply widely to the other liquid discharge apparatus which discharges a liquid. For example, a liquid ejecting apparatus for ejecting a liquid containing a DNA chip in a liquid described in a facsimile machine, a copier, Japanese Unexamined Patent Publication No. 2002-253200, and a liquid containing conductive particles for forming a wiring pattern of a printer wiring board. It is also applicable to the back.

In the above description, the one heat generating resistor 45 has been described as an example of the ink ejection head 23 that heats and ejects the ink 2, but is not limited to such a structure, and includes a plurality of pressure generating elements, The present invention is also applicable to a liquid ejecting apparatus having ejection means capable of controlling the ejection direction by supplying energy to each pressure generating element at different energy or at different timing.

In addition, although the above-mentioned example employ | adopts the electrothermal conversion system which discharges from the nozzle 42a while heating the ink 2 with one heat generating resistor 45, it is not limited to such a system, The Japanese Patent Laid-Open (Small) Ink) by electromechanical conversion elements such as piezoelectric elements, such as piezoelectric elements, described in Japanese Patent Application Laid-Open No. 55-65559, Japanese Patent Laid-Open No. 62-160243, and Japanese Patent Laid-Open Publication No. 2-270561. The electromechanical conversion system which electrostatically discharges from a nozzle may be employ | adopted.

In addition, in the above-mentioned example, although the line-type printer apparatus 1 was demonstrated as an example, it is not limited to this, For example, the serial type which an ink head moves to the direction substantially orthogonal to the running direction of the recording paper P is mentioned. It is also applicable to a liquid discharge device.

Next, the Example and comparative example which actually manufactured the ink which applied this invention is demonstrated.

<Sample 1>

In sample 1, first, a yellow ink was prepared. When producing a yellow ink, it is prescribed | regulated to 3 mass parts of acid yellow 142 used as a pigment, 78 mass parts of water as a solvent, 10 mass parts of glycerin as another solvent, 8 mass parts of 2-pyrrolidone, and P8140: 1998. Water-soluble organic solvent 2-ethyl-2-propyl-1 having a peak appearance time (hereinafter referred to simply as "peak appearance time of the penetration characteristic curve") for plain paper having a Cobb ₃₀ value of 22 ± 2 g / m ² , 1 mass part of 3-propanediol (a in Table 1) was mixed, and it filtered with the membrane filter (brand name: Millex-0.22) of the pore size 0.22 micrometer manufactured by Millipore, and prepared the yellow ink.

Subsequently, black ink was prepared. When producing black ink, 4 parts by mass of food black 2 serving as a pigment, 77 parts by mass of water as a solvent, 10 parts by mass of glycerin as another solvent, 8 parts by mass of 2-pyrrolidone, and peaks of the permeation characteristic curve 1 mass part of 2-ethyl-2-propyl-1,3-propanediol (a in Table 1) whose appearance time is 0.11 second are mixed, and the membrane filter (brand name: Millex-0.22) of the pore size 0.22 micrometer manufactured by Millipore company Black) to prepare a black ink.

<Sample 2>

In Sample 2, yellow-based liquid was prepared in the same manner as in Sample 1, except that 2-methyl-2-butyl-1,3-propanediol (b in Table 1) having a peak appearance time of a penetration characteristic curve of 0.13 seconds was used in the water-soluble organic solvent. Ink and black ink were prepared, respectively.

<Sample 3>

In Sample 3, the water-soluble organic solvent was 3 parts by mass of 2-methyl-2-propyl-1,3-propanediol (c in Table 1) having a peak appearance time of 0.24 sec in the permeation characteristic curve, and 100 parts by mass of water was reduced. A yellow ink and a black ink were prepared in the same manner as in Sample 1, except that they were prepared.

<Sample 4>

In sample 4, the water-soluble organic solvent was 4 parts by mass of 2,2-diethyl-1,3-propanediol (d in Table 1) having a peak appearance time of 0.40 sec. A yellow ink and a black ink were prepared in the same manner as in Sample 1 except that.

<Sample 5>

In Sample 5, the water-soluble organic solvent was 4 parts by mass of 2-methyl-2-ethyl-1,3-propanediol (e in Table 1) having a peak appearance time of 0.50 sec in the permeation characteristic curve, and 100 parts by mass of water was reduced. A yellow ink and a black ink were prepared in the same manner as in Sample 1, except that they were prepared.

<Sample 6>

In sample 6, an ethylene oxide adduct of 2-ethyl-2-butyl-1,3-propanediol represented by the formula (2) as a surfactant (hereinafter referred to as "EBPD-EO") (m + n = 2) A yellow ink and a black ink were prepared in the same manner as in Sample 1, except that 0.5 parts by mass of water was added and water was reduced to 100 parts by weight in total.

<Sample 7>

In sample 7, the water-soluble organic solvent was 3 parts by mass of 2-methyl-2-propyl-1,3-propanediol (c in Table 1) having a peak appearance time of 0.24 sec. Yellow-based ink and black-based ink were prepared in the same manner as in Sample 1 except that 0.5 parts by mass of EBPD-EO (m + n = 2) indicated was added and water was reduced to 100 parts by mass in total.

<Sample 8>

In sample 8, the water-soluble organic solvent is 4 parts by mass of 2,2-diethyl-1,3-propanediol (d in Table 1) having a peak appearance time of 0.40 sec in the permeation characteristic curve, and is further represented by Chemical Formula 2 as a surfactant. Yellow ink and black ink were prepared in the same manner as in Sample 1, except that 0.5 parts by mass of EBPD-EO (m + n = 2) was added, and water was reduced to 100 parts by mass in total.

<Sample 9>

In sample 9, yellow was the same as in sample 1 except that the water-soluble organic solvent was 4 parts by mass of 2-propyl-1,4-butanediol having a peak appearance time of 0.44 sec in the permeation characteristic curve, and the water was reduced to 100 parts by mass in total. The ink of the system and the ink of the black system were prepared respectively.

<Sample 10>

In Sample 10, a yellow ink and a black ink were prepared in the same manner as in Sample 1, except that the water-soluble organic solvent was used as 1 part by mass of 2,4-diethyl-1,5-pentanediol having a peak appearance time of 0.036 sec. Inks were each prepared.

<Sample 11>

In Sample 11, the water-soluble organic solvent was prepared in the same manner as in Sample 1, except that 3 parts by mass of 2-ethyl-1,3-hexanediol having a peak appearance time of 0.047 seconds in the permeation characteristic curve were used and 100 parts by mass of water was reduced. Yellow ink and black ink were prepared, respectively.

<Sample 12>

In Sample 12, the water-soluble organic solvent was used in the same manner as in Sample 1 except that 4 parts by mass of 2-methyl-2,4-pentanediol having a peak appearance time of 0.54 sec in the permeation characteristic curve were used and 100 parts by mass of water was reduced. Yellow ink and black ink were prepared, respectively.

<Sample 13>

In the sample 13, the yellow ink was the same as the sample 1 except that the water-soluble organic solvent was 4 parts by mass of 1,7-heptanediol having a peak appearance time of 0.53 seconds in the permeation characteristic curve, and the total amount was reduced by 100 parts by mass. And black ink were prepared, respectively.

<Sample 14>

In Sample 14, the water-soluble organic solvent was used as 4 parts by mass of 3,3-dimethyl-1,5-pentanediol having a peak appearance time of 0.52 seconds in the permeation characteristic curve, except that water was reduced to 100 parts by mass in total. Similarly, yellow ink and black ink were prepared, respectively.

<Sample 15>

In Sample 15, the water-soluble organic solvent was 4 parts by mass of 1,7-heptanediol having a peak appearance time of 0.53 seconds in the permeation characteristic curve, and further 0.5 mass of EBPD-EO (m + n = 2) represented by the formula (2) as a surfactant. A yellow ink and a black ink were prepared in the same manner as in Sample 1 except that portions were added and water was reduced to 100 parts by weight in total.

<Sample 16>

In Sample 16, the water-soluble organic solvent was 4 parts by mass of 1,7-heptanediol having a peak appearance time of 0.53 seconds in the permeation characteristic curve, and further, olefin E1010 (acetylene glycol-based nonionic surfactant, manufactured by Nissin Chemical Industries, Ltd.) as a surfactant. Yellow- and black-based inks were prepared in the same manner as in Sample 1, except that 0.5 parts by mass were added and water was reduced to 100 parts by mass in total.

The ink of each sample was evaluated for ignition density, border bleeding, mixed color solid staining, and non-simmering image. The evaluation results are shown in Table 2 below.

In addition, the flammability concentration was evaluated as follows. The black ink of each sample was filled in an ink tank, mounted on a head cartridge, and used as copy paper (trade name: Mitsubishi PPC Paper, manufactured by Mitsubishi Paper Co., Ltd.) as a recording paper in a line-type ink jet printer device. Black solid printing was performed, and the reflection printing density | concentration was measured with the optical density meter (TR924) by a Macbeth company with respect to the obtained image.

The border bleeding was evaluated as follows. Copy paper (trade name: Mitsubishi PPC Paper, manufactured by Mitsubishi Paper Co., Ltd.), which is plain paper, is used as a recording paper in a line-type ink jet printer device in which yellow ink and black ink of each sample are respectively filled in an ink tank and attached to a head cartridge. Solid printing in which each color was adjacent to the recording paper was performed, and the degree of bleeding of the boundary of each color in the printed image was visually observed.

The mixed solid stains were evaluated as follows. Copy paper (trade name: Mitsubishi PPC Paper, manufactured by Mitsubishi Paper Co., Ltd.), which is plain paper, is used as a recording paper in a line-type ink jet printer device in which yellow ink and black ink of each sample are respectively filled in an ink tank and attached to a head cartridge. 80% density solid printing was performed by superimposing each color on this recording paper, and the uniformity of the color density in the printed image, that is, the presence or absence of color unevenness, was visually observed.

The reflection of an image was evaluated as follows. The printed image produced by the above-mentioned evaluation of boundary bleeding was visually observed from the back side of the printing surface, and the degree of image reflection and the bleeding of ink were evaluated.

In addition, for the ink of each sample, 0 second dynamic surface tension and static surface tension at 25 ° C. were measured using a surface tension meter (CBVP-Z) manufactured by Kyowa Kaimen Chemical Corporation. For all samples, the value of zero second dynamic surface tension is a measure of solvent excluding pigments and surfactants. The value of the static surface tension is a measure after black and yellow ink production.

In Table 2, in boundary blurring, there is no bleeding of each color at the boundary part, and it indicates that there is no problem in image quality, but there is a small amount of bleeding of each color at the boundary part. The bleeding of the color is indicated by Δ, and the bleeding of each color and the deterioration in image quality are marked by the x mark on the entire boundary.

In addition, in Table 2, in the mixed-color solid stain, the solid printed image shows no color unevenness at all, and indicates that there is no problem in image quality, but there is a slight color unevenness in the image. A color unevenness is indicated by a Δ mark, and a color unevenness and a deterioration in image quality in the entire image are indicated by a x mark.

In addition, in the image immersion in Table 2, it shows with ◎ mark that there is little shine of an image, it shows with a ○ mark that a see-through is seen but there is no problem in quality, and partial immersion, for example, a spot shape, has ink bleeding out Is shown by (triangle | delta) display, and it is shown by x mark that the whole image is reflected.

From the results shown in Table 2, the yellow and black inks of Samples 1 to 9 were good in all evaluations of ignition density, border bleeding, mixed color solid stains, and image reflecting as compared to the yellow and black inks of Samples 10 to 16. It was.

In Sample 10 and Sample 11, the peak appearance time of the penetration characteristic curve of the water-soluble organic solvent contained in the ink was 0.036 seconds and 0.047 seconds, which is faster than 0.1 second. It became too high and the entire image was reflected. In addition, in Samples 10 and 11, the permeation of the ink into the recording paper was high, so the print density decreased.

In addition, in Samples 12 to 16, the peak appearance time of the penetration characteristic curve of the water-soluble organic solvent contained in the ink is slower than 0.5 seconds, so that the ink penetrates into the recording paper poorly, resulting in deterioration of image quality and color unevenness. This occurred. Further, in Samples 12 to 16, the penetration of the ink into the recording paper was poor, and the ink was reflected on the back side of the recording paper in spots.

With respect to these samples 10 to 16, in the samples 1 to 9, since the peak appearance time of the penetration characteristic curve of the water-soluble organic solvent contained in the ink was 0.1 second or more and 0.5 second or less, it was applied to the surface of the fibers of the recording paper and the sizing agent. It was possible to prevent ink from penetrating uniformly and diffusing and penetrating only along the fibers. In Samples 1 to 9, there was no bleeding or color unevenness of each color at the boundary portion, and there was little shining, and border bleeding, mixed color solid staining, and shining were prevented. In addition, in Samples 1 to 9, ink penetrated uniformly into the recording paper, so that the print density was good.

In addition, in Sample 3, Sample 4, Sample 7 and Sample 8, the 0 second dynamic surface tension is 35 mN / m or more and 40 mN / m or less, and Sample 3 has a static surface tension of 34 mN / m or more and 39 mN / m or less. Sample 7 and Sample 8 contain EBPD-EO as a surfactant, and the static surface tension is in the range of 34 mN / m or more and 39 mN / m or less, so that the ignition concentration is high, and the boundary bleeding and mixed color solids are higher. Staining and shining were prevented Accordingly, Sample 3, Sample 7 and Sample 8 were good in all evaluations of ignition concentration, border bleeding, mixed color solid staining, and image reflecting.

From the above, when the ink is prepared, a water-soluble organic solvent having a peak appearance time of the penetration characteristic curve of 0.1 to 0.5 seconds is contained, and the 0 second dynamic surface tension is set to 35 mN / m or more and 40 mN / m or less, In addition, by containing EBPD-EO as a surfactant, the static surface tension is set to 34 mN / m or more and 39 mN / m or less, particularly in the case of using plain paper as a recording paper, so that a high ignition concentration is obtained. In addition, it has been found to be of great importance in producing an ink capable of preventing light shining.

In addition, it is clear for those skilled in the art that the present invention is not limited to the above-described embodiments described with reference to the drawings, and that various changes, substitutions, or equivalents thereof can be made without departing from the scope of the appended claims and their known features. .

Claims (26)

In the recording liquid attached to the object in the state of droplets for recording on the object, Coloring, A solvent for dissolving or dispersing the dye, Water-soluble organics having a peak appearance time of a penetration characteristic curve of 0.1 to 0.5 seconds with respect to plain paper having a Cobb ₃₀ value of 22 ± 2 g / m ² , as specified in JIS P8140: 1998, measured by an ultrasonic permeable dynamic liquid permeability measuring device. The recording liquid which has a solvent. The recording liquid according to claim 1, wherein the 0 second dynamic surface tension is at least 35 mN / m and at most 40 mN / m. The recording liquid according to claim 1, wherein the water-soluble organic solvent is a compound represented by the following general formula (1). <Formula 1>

(Wherein R ₁ and R ₂ each represent an aliphatic saturated hydrocarbon group, 3 ≦ R ₁ + R ₂ ≦ 4, and R ₁ , R ₂ ≧ ₁ ). The method of claim 3, wherein the water-soluble organic solvent is 2-ethyl-2-propyl-1,3-propanediol, 2-methyl-2-butyl-1,3-propanediol, 2-methyl-2-propyl-1 At least one of -3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, and 2-propyl-1,4-butanediol Record amount to say. The recording liquid according to claim 1, further comprising a surfactant, wherein the static surface tension is 34 mN / m or more and 39 mN / m or less. The recording solution according to claim 5, wherein the surfactant contains a compound represented by the following formula (2). <Formula 2>

(In formula, m and n are integers of 0-10, respectively, satisfying 1 <= m + n <= 10.) A liquid cartridge mounted in a liquid ejecting head provided in a liquid ejecting apparatus for recording by ejecting a recording liquid in a droplet state and adhering to an object, wherein the liquid cartridge serves as a supply source of the recording liquid to the liquid ejecting head, The recording liquid penetrated into plain paper having a dye, a solvent for dissolving or dispersing the dye, and a Cobb ₃₀ value defined in JIS P8140: 1998 measured by an ultrasonic permeable dynamic liquid permeability measuring device of 22 ± 2 g / m ² . A liquid cartridge comprising a water-soluble organic solvent having a peak appearance time of a characteristic curve of 0.1 second to 0.5 second. 8. A liquid cartridge according to claim 7, wherein a zero second dynamic surface tension of said recording liquid is 35 mN / m or more and 40 mN / m or less. The liquid cartridge according to claim 7, wherein the water-soluble organic solvent is a compound represented by the following formula (1). <Formula 1>

(Wherein R ₁ and R ₂ each represent an aliphatic saturated hydrocarbon group, 3 ≦ R ₁ + R ₂ ≦ 4, and R ₁ , R ₂ ≧ ₁ ). The method of claim 9, wherein the water-soluble organic solvent is 2-ethyl-2-propyl-1,3-propanediol, 2-methyl-2-butyl-1,3-propanediol, 2-methyl-2-propyl-1 At least one of -3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, and 2-propyl-1,4-butanediol Liquid cartridge. 8. The liquid cartridge according to claim 7, wherein the recording liquid further has a surfactant, and the static surface tension is 34 mN / m or more and 39 mN / m or less. The liquid cartridge according to claim 11, wherein the surfactant contains a compound represented by the following formula (2). <Formula 2>

(In formula, m and n are integers of 0-10, respectively, satisfying 1 <= m + n <= 10.) An apparatus main body, a liquid chamber provided in the apparatus main body and storing a recording liquid, a supply unit for supplying the recording liquid to the liquid chamber, and at least one pressure chamber installed in the liquid chamber and generating pressure to pressurize the recording liquid stored in the liquid chamber. A liquid discharge head having an element, a discharge port for discharging the recording liquid pressurized by the pressure generating element from the respective liquid chambers toward the main surface of the object in a droplet state, and connected to the liquid discharge head. A liquid ejecting apparatus comprising a liquid cartridge serving as a supply source of the recording liquid, The recording liquid penetrated into plain paper having a dye, a solvent for dissolving or dispersing the dye, and a Cobb ₃₀ value defined in JIS P8140: 1998 measured by an ultrasonic permeable dynamic liquid permeability measuring device of 22 ± 2 g / m ² . A liquid discharge device comprising a water-soluble organic solvent having a peak appearance time of a characteristic curve of 0.1 second to 0.5 second. The liquid ejecting apparatus according to claim 13, wherein the zero second dynamic surface tension of the recording liquid is 35 mN / m or more and 40 mN / m or less. The liquid discharge apparatus according to claim 13, wherein the water-soluble organic solvent is a compound represented by the following general formula (1). <Formula 1>

(Wherein R ₁ and R ₂ each represent an aliphatic saturated hydrocarbon group, 3 ≦ R ₁ + R ₂ ≦ 4, and R ₁ , R ₂ ≧ ₁ ). The method of claim 15, wherein the water-soluble organic solvent is 2-ethyl-2-propyl-1,3-propanediol, 2-methyl-2-butyl-1,3-propanediol, 2-methyl-2-propyl-1 At least one of -3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, and 2-propyl-1,4-butanediol Liquid discharge device. The liquid ejecting apparatus according to claim 13, wherein the recording liquid further has a surfactant, and the static surface tension is 34 mN / m or more and 39 mN / m or less. The liquid discharge apparatus according to claim 17, wherein the surfactant contains a compound represented by the following Chemical Formula 2. <Formula 2>

(In formula, m and n are integers of 0-10, respectively, satisfying 1 <= m + n <= 10.) The liquid ejecting apparatus according to claim 13, wherein the ejection openings of the liquid ejecting head are substantially parallel to each other. An apparatus main body, a liquid chamber provided in the apparatus main body and storing a recording liquid, a supply unit for supplying the recording liquid to the liquid chamber, and at least one pressure chamber installed in the liquid chamber and generating pressure to pressurize the recording liquid stored in the liquid chamber. A liquid discharge head having an element, a discharge port for discharging the recording liquid pressurized by the pressure generating element from the respective liquid chambers toward the main surface of the object in a droplet state, and connected to the liquid discharge head. A liquid ejecting method by a liquid ejecting apparatus comprising a liquid cartridge serving as a supply source of the recording liquid, Of penetration characteristics curves for pigments, solvents for dissolving or dispersing the pigments, and plain paper having a Cobb ₃₀ value defined in JIS P8140: 1998 measured by an ultrasonic permeable dynamic liquid permeability measuring device of 22 ± 2 g / m ² . A liquid ejecting method, comprising: discharging a recording liquid containing a water-soluble organic solvent having a peak appearance time of 0.1 second to 0.5 second. 21. The liquid discharge method according to claim 20, wherein the zero second dynamic surface tension of the recording liquid is 35 mN / m or more and 40 mN / m or less. The liquid discharge method according to claim 20, wherein the water-soluble organic solvent is a compound represented by the following general formula (1). <Formula 1>

(Wherein R ₁ and R ₂ each represent an aliphatic saturated hydrocarbon group, 3 ≦ R ₁ + R ₂ ≦ 4, and R ₁ , R ₂ ≧ ₁ ). The method of claim 22, wherein the water-soluble organic solvent is 2-ethyl-2-propyl-1,3-propanediol, 2-methyl-2-butyl-1,3-propanediol, 2-methyl-2-propyl-1 , 3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-ethyl-1,3-propanediol, 2-propyl-1,4-butanediol Liquid discharge method. 21. The liquid discharge method according to claim 20, wherein the recording liquid further has a surfactant, and the static surface tension is 34 mN / m or more and 39 mN / m or less. The liquid discharge method according to claim 24, wherein the surfactant contains a compound represented by the following Chemical Formula 2. <Formula 2>

(In formula, m and n are integers of 0-10, respectively, satisfying 1 <= m + n <= 10.) The liquid ejecting method according to claim 20, wherein the ejection openings of the liquid ejecting head are arranged substantially in a line shape.

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